Calories for Work…

The metabolism of a farm worker during harvesting would require 4,300 kcal. The peak values of the daily calorie consumption for lumberjacks would amount to approximately 6,000 kcal for a 70 kg person. Long-distance racing cyclists, however, could reach a peak daily metabolic rate of 11,000 kcal.

Rubner [see Roux, 1895] believed that the limiting factor for the uptake of calories in the human body was the intestinal system. A repeat of such great exertion over several days would inevitably lead to loss of body weight.” (Tipton, 2014, p.62).